Divergent Cycloaddition and Ring-Closing Metathesis Approaches to Indolizidine and Pyrrolo[1,2-<i>a</i>]azepine Skeletons from a Chiral Precursor: An Expeditious Route to (−)-8-<i>epi</i>-Swainsonine Triacetate
作者:Madhumita Nath、Ranjan Mukhopadhyay、Anup Bhattacharjya
DOI:10.1021/ol052716a
日期:2006.1.1
[reaction: see text] A divergent strategy for the synthesis of diverse azabicyclic ring systems has been developed in which a chiral N-allylpyrrolidine derivative, obtained from a carbohydrate precursor was converted to (-)-8-epi-swainsonine triacetate by RCM and to a pyrrolo[1,2-a]azepine derivative and a 3-hydroxymethyl-substituted indolizidine by N-allylcarbohydrate nitrone and nitrile oxide cycloadditions
[反应:见正文]已开发出用于合成多种氮杂双环系统的不同策略,其中,由碳水化合物前体获得的手性N-烯丙基吡咯烷衍生物通过RCM和NH4转化为(-)-8-表-swainsonine三乙酸盐。通过N-烯丙基碳水化合物水合腈和一氧化氮环加成反应得到吡咯并[1,2-a] a庚因衍生物和3-羟甲基取代的吲哚并立定。